Description from the manufacturer (Lindy Fralin):

The Lindy Fralin 4 String Jazz Bass Pickup Set offers a loud, clear and even response to four string bass players. Using ALNICO V magnets and 42 gauge Heavy Formvar wire, all Lindy Fralin pickups are hand wound to vintage specifications.

Lindy Fralin 4 String Jazz Bass Pickups are wound to 8 K (neck) and 8.5 K (bridge).

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Lindy is a true vintage guy, going after authentic vintage tone. Visit the Lindy Fralin website –  Lindy Fralin Pickups

THE LOW DOWN: LINDY FRALIN 4 STRING JAZZ BASS PICKUP SET – REVIEW:

• One of the premier pickups for vintage tone, an excellent and very legit vintage reproduction choice
• These pickups are  brighter than most other vintage jazz pickups that are available
• Glassy top end that is smooth with medium output
• Medium output
• With rock or distorted guitars, it may be necessary to do some dialing on your amp to find the best spot to be heard…but these are definitely worth a go.
• Typical fit in standard Fender Jazz Basses (with a long bridge and short neck pickup)